XPK Start: Tue Apr 21 12:18:22 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-21 12:18:47.003948: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303) I0421 12:18:47.543741 140534246274880 max_utils.py:273] Attempting to initialize the jax distributed system... I0421 12:18:56.586148 140534246274880 distributed.py:149] Starting JAX distributed service on [::]:8482 I0421 12:18:56.588560 140534246274880 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-false-fql1z-slice-job-0-0.mt-10-shardy-false-fql1z:8482 I0421 12:18:57.787176 140534246274880 max_utils.py:284] Jax distributed system initialized! I0421 12:19:04.080117 140534246274880 max_utils.py:800] System Information: Jax Version: 0.9.2 I0421 12:19:04.080216 140534246274880 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0421 12:19:04.080256 140534246274880 max_utils.py:802] System Information: Jax Backend: PJRT C API TFRT TPU v6 lite Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365 I0421 12:19:04.080290 140534246274880 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 12:19:04.783037 140534246274880 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 12:19:04.783613 140534246274880 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0421 12:19:04.783812 140534246274880 checkpointing.py:688] Setting up checkpoint logger... I0421 12:19:04.783864 140534246274880 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 12:19:04.783915 140534246274880 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0421 12:19:04.784241 140534246274880 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7fcff6150710>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 12:19:07.686841 140534246274880 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 12:19:07.687083 140534246274880 checkpoint_manager.py:708] [process=7][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7fbbe00ff290>}, handler_registry=None I0421 12:19:07.687318 140534246274880 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7fbbe00ff290>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`. I0421 12:19:07.687368 140534246274880 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7fbbe0103e00>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`. I0421 12:19:07.687402 140534246274880 composite_checkpoint_handler.py:505] Initialized registry DefaultCheckpointHandlerRegistry({('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7fbbe00ff290>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7fbbe00ff290>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7fbbe0103e00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7fbbe0103e00>}). I0421 12:19:07.687714 140534246274880 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0421 12:19:07.687801 140534246274880 async_checkpointer.py:192] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7fbbb8440180> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0421 12:19:08.807775 140534246274880 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints I0421 12:19:09.138938 140534246274880 checkpoint_manager.py:929] [process=7][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7fbbe0101d00> I0421 12:19:09.139117 140534246274880 checkpointing.py:302] Checkpoint manager created! I0421 12:19:10.070107 140534246274880 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 12:19:10.070206 140534246274880 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 12:19:10.447862 140534246274880 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 12:19:10.447949 140534246274880 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 12:19:10.464130 140534246274880 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 12:19:10.464188 140534246274880 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0421 12:19:10.488004 140534246274880 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 12:19:10.488075 140534246274880 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 12:19:10.504371 140534246274880 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 12:19:10.504432 140534246274880 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 12:19:10.520813 140534246274880 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 12:19:10.520872 140534246274880 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 12:19:10.546322 140534246274880 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 12:19:10.546389 140534246274880 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0421 12:19:10.567267 140534246274880 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 12:19:10.567329 140534246274880 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0421 12:19:10.783296 140534246274880 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 12:19:10.783403 140534246274880 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0421 12:19:12.185127 140534246274880 maxtext_utils.py:1827] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0421 12:19:12.185247 140534246274880 maxtext_utils.py:1827] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 12:19:12.185298 140534246274880 maxtext_utils.py:1827] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0421 12:19:12.185381 140534246274880 maxtext_utils.py:1827] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0421 12:19:12.185437 140534246274880 maxtext_utils.py:1827] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0421 12:19:12.185477 140534246274880 maxtext_utils.py:1827] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0421 12:19:12.185533 140534246274880 maxtext_utils.py:1827] params/params/decoder/layers/self_attention/key/kernel Shape: float32[2048,16,16,128] Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0421 12:19:12.185586 140534246274880 maxtext_utils.py:1827] params/params/decoder/layers/self_attention/out/kernel Shape: float32[16,16,128,2048] Logical: P('heads', 'layers', 'kv', 'embed') Physical: (None, None, None, 'fsdp') I0421 12:19:12.185625 140534246274880 maxtext_utils.py:1827] params/params/decoder/layers/self_attention/query/kernel Shape: float32[2048,16,16,128] Logical: P('embed', 'layers', 'q_heads', 'kv') Physical: ('fsdp', None, None, None) I0421 12:19:12.185660 140534246274880 maxtext_utils.py:1827] params/params/decoder/layers/self_attention/value/kernel Shape: float32[2048,16,16,128] Logical: P('embed', 'layers', 'kv_heads', 'kv_head_dim') Physical: ('fsdp', None, None, None) I0421 12:19:12.185707 140534246274880 maxtext_utils.py:1827] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0421 12:19:12.185773 140534246274880 maxtext_utils.py:1827] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0421 12:19:12.680780 140534246274880 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 12:19:12.680878 140534246274880 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0421 12:19:12.696597 140534246274880 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0421 12:19:12.696658 140534246274880 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0421 12:19:23.589831 140534246274880 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0421 12:19:23.590666 140534246274880 metric_logger.py:301] number parameters: 1.104 billion I0421 12:19:34.853937 140534246274880 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 12:19:35.007683 140534246274880 checkpointing.py:798] Waited 0.15372848510742188 seconds for step 0 to finish before starting checkpointing. I0421 12:19:35.010153 140534246274880 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 12:19:35.011792 140534246274880 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 0 I0421 12:19:35.013283 140534246274880 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/0. I0421 12:19:35.762583 140534246274880 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 12:19:35.763598 140534246274880 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0421 12:19:35.763657 140534246274880 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0421 12:19:36.037290 140534246274880 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.274779s I0421 12:19:36.037466 140534246274880 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 5.505 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2801980972290039 s) (per-host) I0421 12:19:36.037522 140534246274880 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.280264s (batch_requests_ready=0.002208s, total_serialization_initiated=0.277983s, others=0.000073s) I0421 12:19:36.037620 140534246274880 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.284651s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.284633) I0421 12:19:36.038447 140534246274880 event_tracking.py:125] [process=7] [async] Finished blocking save in 1.03 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/0. I0421 12:19:36.038779 140405551126272 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:39:36.038729 I0421 12:19:36.051691 140534246274880 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 12:19:36.051965 140403905537792 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save. I0421 12:19:36.052097 140534246274880 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776773975.0101364, 'wait_for_prev_duration_secs': 6.103515625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776773975.011829, 'checkpointer_blocking_duration_secs': 1.0271003246307373, 'get_old_steps_start_time': 1776773976.0389547, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776773975.0081735, 'checkpoint_manager_blocking_duration_secs': 1.0438852310180664} I0421 12:19:36.052204 140534246274880 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 12:19:36.052253 140534246274880 max_utils.py:750] Memstats: After params initialized: I0421 12:19:36.052302 140534246274880 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0)) I0421 12:19:36.052334 140534246274880 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0)) I0421 12:19:36.052361 140534246274880 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0)) I0421 12:19:36.052385 140534246274880 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0)) I0421 12:19:36.365206 140534246274880 metric_logger.py:196] completed step: 0, seconds: 11.263, TFLOP/s/device: 1.206, Tokens/s/device: 181.832, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0421 12:19:36.543177 140534246274880 metric_logger.py:196] completed step: 1, seconds: 1.510, TFLOP/s/device: 8.999, Tokens/s/device: 1356.485, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0421 12:19:36.968159 140534246274880 metric_logger.py:196] completed step: 2, seconds: 0.031, TFLOP/s/device: 442.491, Tokens/s/device: 66697.062, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129 I0421 12:19:37.115581 140534246274880 metric_logger.py:196] completed step: 3, seconds: 0.425, TFLOP/s/device: 31.970, Tokens/s/device: 4818.858, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203 I0421 12:19:37.410802 140534246274880 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.707, Tokens/s/device: 13370.939, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614 I0421 12:19:37.416415 140534246274880 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.271, Tokens/s/device: 13908.036, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717 I0421 12:19:39.000032 2793 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 12:19:41.011452 140403913930496 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/0/items/array_metadatas/process_7 I0421 12:19:59.099241 140534246274880 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.980, Tokens/s/device: 6930.603, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759 I0421 12:19:59.246693 140534246274880 metric_logger.py:196] completed step: 7, seconds: 21.536, TFLOP/s/device: 0.631, Tokens/s/device: 95.096, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905 I0421 12:19:59.393949 140534246274880 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.309, Tokens/s/device: 13461.640, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406 I0421 12:19:59.540758 140534246274880 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 12:19:59.541345 140534246274880 checkpointing.py:798] Waited 0.0006289482116699219 seconds for step 9 to finish before starting checkpointing. I0421 12:19:59.543377 140534246274880 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 12:20:12.534295 140405551126272 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 42.951 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.776987075805664 s) (per-host) I0421 12:20:12.534420 140405551126272 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.495531s. I0421 12:20:21.456477 140405551126272 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 45.417570s. I0421 12:20:21.456806 140403905537792 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 12:20:21.456936 140403905537792 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save. I0421 12:20:21.456987 140403905537792 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 12:20:21.458645 140403905537792 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 12:20:21.458816 140534246274880 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0421 12:20:21.458945 140534246274880 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.915569 seconds. If this number is high, consider checkpointing less frequently. I0421 12:20:21.460863 140534246274880 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 9 I0421 12:20:21.462998 140534246274880 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/9. I0421 12:20:21.755145 140534246274880 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0421 12:20:21.755240 140534246274880 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False I0421 12:20:21.792806 140534246274880 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.038775s I0421 12:20:21.792972 140534246274880 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 36.576 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04217410087585449 s) (per-host) I0421 12:20:21.793022 140534246274880 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.042233s (batch_requests_ready=0.001756s, total_serialization_initiated=0.040411s, others=0.000066s) I0421 12:20:21.793107 140534246274880 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.046318s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.046302) I0421 12:20:21.793849 140534246274880 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.33 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/9. I0421 12:20:21.794188 140403905537792 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:40:21.794150 I0421 12:20:21.796178 140534246274880 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 12:20:21.796476 140405523703552 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save. I0421 12:20:21.796641 140534246274880 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776773999.5433476, 'wait_for_prev_duration_secs': 21.915568590164185, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776774021.4609025, 'checkpointer_blocking_duration_secs': 0.3334219455718994, 'get_old_steps_start_time': 1776774021.794348, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776773999.541565, 'checkpoint_manager_blocking_duration_secs': 22.25503921508789} I0421 12:20:21.796771 140534246274880 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 12:20:21.796819 140534246274880 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 12:20:26.936894 140405532096256 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/9/items/array_metadatas/process_7 I0421 12:21:02.969394 140403905537792 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 38.322 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.218560457229614 s) (per-host) I0421 12:21:02.969506 140403905537792 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.175207s. I0421 12:21:10.116896 140403905537792 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 48.322582s. I0421 12:21:10.117176 140405523703552 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 12:21:10.117293 140405523703552 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save. I0421 12:21:10.117339 140405523703552 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 12:21:10.118617 140405523703552 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 12:21:10.118804 140534246274880 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0421 12:21:10.118897 140534246274880 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 12:21:10.119828 140534246274880 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.258, Tokens/s/device: 13906.147, total_weights: 65536, loss: 8.179, lm_loss: 8.179, perplexity: 3564.635 Per train step: Total TFLOPs: 13.59 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 12:21:19 UTC 2026 EXIT_CODE=0